In Whichof the followingoptionsorder ofarrangementdoes notagree withthe variationof property indicatedagainst it ?

In Whichof the followingoptionsorder ofarrangementdoes notagree withth

1.	In Whichof the followingoptionsorder ofarrangementdoes notagree withthe variationof property indicatedagainst it ?
Answer» `A1^(3+) lt Mg^(2+) lt Na^(+) lt F^(-)` ( increasingionicsize ) `B lt C lt N lt O ` (increasingfirst ionisation enthalpy ) `I lt Br lt C lt F` (increasingelectron gain enthalpy ) `Li lt Na lt K lt Rb` (increasingmetallicradius ) Solution :the ionicsize increasesas the + Ve CHARGEON the cation decreasesor the -vecharge on theanion increase Thereforeoption(a) iscorrect. than thatof O.Thusoption(b) isincorrect. Dueto greaterstabilityof the half-filledelectronicconfigurationor OFN its IONIZATIONENTHALPYIS higher than thatof O. Thusoption ( b) isincorrect. Duttostrongerelectron- electronrepulsion in thed smallsizeof F thenegativeelectron gainenthalpy ofF ISLOWER thanthat of C1 .Thusoption( c) isincorrect. Themetalliccharacterincreasesas the sizeof the metallicatomincrease. thusoption (d) iscorrect. Thusoptions ( b) and (c) AREINCORRECT.